23
• Minimum and maximum combustion air and vent pipe
lengths listed in Table 5. Pipe length counted from
combustion air connector to termination.
•
Install field-sourced 2" to 3" transition, if used, in vertical
section at combustion air inlet and vent connector.
•
90° elbows equivalent to 5.0 ft (1.6 m). 45° elbows
equivalent to 3.5 ft (1.1 m). 2" to 3" and 3" x 4"
transition have no equivalent length. See Table 6.
•
Use flexible Polypropylene piping (PP) in a vertical
position only. Check PP pipe manufacturer for details.
Each foot of PP flexible pipe is equivalent to 2
⅝
feet of
smooth pipe of same diameter.
• Slope vent pipes minimum 1/4" per foot (21 mm/m)
back toward boiler. Support horizontal sections to
prevent sags capable of accumulating condensate.
•
Support piping in accordance with pipe manufacturer's
instruction and authority having jurisdiction. In absence
of manufacturer's instruction use pipe hooks, pipe
straps, brackets, or hangers of adequate and strength
located at intervals of 4 ft (1.2m) or less. Allow for
expansion/contraction of pipe.
• Combustion air and vent piping must be air tight and
water tight.
•
Certified vent system components must NOT be
interchanged with other vent systems or unlisted pipe/
fittings.
6.5
Vent
Termination
Minimum/Maximum Vent Lengths
2” Pipe
3” Pipe
Model
050/075/100
075/100
150/200
Min.
6 ft.
(1.8 m)
6 ft.
(1.8 m)
6 ft.
(1.8 m)
Max.
50 ft.
(15.2 m)
100 ft.
(30.5 m)
100 ft.
(30.5 m)
Table 5 - Combustion Air and Vent Piping Length
For Example: Boiler can be installed on outside wall and vented with one 90° elbow and 1 ft (0.30 m) of vent pipe.
Table 6 -Equivalent Length of Venting Components
Equivalent Length of Venting Components
Component
Feet
Meters
90° Elbow
5
1.6
45° Elbow
3½
1.1
2" x 3" Adapter
0
0
3" x 4" Adapter
0
0
Concentric Vent Kit
5
1.6
Polypropylene Flexible Pipe per Foot
2⅝
0.8
6 - COMBUSTION AIR AND VENT PIPING
•
Terminate combustion air and vent pipes with fittings or
concentric vent kit.
A. See "Parts, Kits and Optional Accessories" manual
for concentric vent kit part numbers.
B.
Use horizontal pipe for vent and 90° elbow for
combustion air termination when using fittings.
•
Follow figures 6-1 thru 6-19 for termination of
combustion air and vent pipes.
• Locate combustion air termination as far as possible
from swimming pool, swimming pool pump house, and
other sources of airborne chlorine.
• Locate combustion air and vent terminals as required by
authority having jurisdiction.
6.9
Condensate Piping
• Use materials acceptable to authority having jurisdiction.
In absence of such authority:
• USA - PVC or CPVC per ASTM D1785/D2845 Cement
or primer per ASME D2564 or F493.
WARNING
Vent extending through exterior wall shall not
terminate adjacent to wall or below building
extensions such as eaves, balconies, parapets or
decks. Failure to comply could result in death or
serious injury.
!
PN 240011342 Rev. E [05/31/2018]
